Bench mounting fixture for portable belt sander



Jan. 16, 1962 R. HAPPE ETAL BENCH MOUNTING FIXTURE FOR PORTABLE BELT SANDER Filed Dec. 30, 1960 2 Sheets-Sheet 1 JNVENTORS. REYNOLD HAPPE and JOSEPH P. LUBAS BY Z'TORNEY \WMMimi WITNESS.

Jan. 16, 1962 R. HAPPE ET AL 3,016,659

BENCH MOUNTING FIXTURE FOR PORTABLE BELT SANDER Filed Dec. 30, 1960 2 Sheets-Sheet 2 39 v/ 43 INVENTORS. REYNOLD HAPPE and WIT/V555 JOSEPH P. LUBAS itd dtates Patented Jan. 16, 1962 3,016,659 BENCH MOUNTING FIXTURE FOR PGRTABLE BELT SANDER Reynold Happe, Greenville, S.C and Joseph P. Lukas, Crauford, Ni, assignors to The Singer lviiauufacturing Company, Elizabeth, NJ, a corporation of New Jersey Filed Dec. 39, 1960, Ser. No. 79,612 8 Claims. ((Il. 51-It66) This invention relates to portable belt sanders designed to be carried to the work to be sanded and to be manipulated relatively to a substantially stationary work surface during use. More particularly this invention relates to a novel bench mounting fixture by which. a portable belt sander may be readily and conveniently supported immobile and adapted to have work pieces carried to the sander and manipulated relatively to the belt sander during use.

It is an object of this invention to provide a bench mounting fixture to which a complete portable belt sander may be quickly and conveniently attached or removed to provide for ready conversion from a portable to an immobilized belt sanding unit Another object of this invention is to provide a bench mounting fixture for a portable belt sander in which the working flight of the sanding belt may be quickly and easily arranged either horizontally or vertically to suit the type of work to be accomplished.

Still another object of this invention is to provide a novel and improved work guiding fence construction which may be selectively arranged either transversely across or parallel to the working flight of the sanding belt and which in either arrangement may be adjusted angularly relatively to the plane of the working flight of the sanding belt.

Other and further objects and advantages of the invention will appear from the following description taken in connection with the accompanying drawings of a preferred embodiment in which:

FIG. 1 represents a top plan view of the bench mounting fixture of this invention, illustrating in dashed lines a portable belt sander attached thereto,

FIG. 2 represents a right side elevational view of the fixture of FIG. 1,

FIG. 3 represents a front elevational view of the bench mounting fixture of FIG. 1, with a portion of a portable belt sander, namely, the driving chain guard, illustrated in solid lines and cross sectioned substantially along line 3-3 of FIG. 1 and the remainder of the belt sander illustrated in dashed lines, and

FIG. 4 is a perspective view of the bench mounting fixture of this invention with the portions of the work guiding fence exploded to illustrate the relationship therebetween.

The bench mounting fixture of this invention may be constructed to accommodate practically any of the currently known portable belt sanders. The belt sander, illustrated in the drawings by way of a preferred embodiment and indicated generally as 11, is provided with a casing including an electric motor housing portion 12 from which extends a carrying handle 13 and a hand grip 141. The motor housing portion 12, of the casing extends from a sanding belt guard portion 15 of the casing which accommodates and encases one side of a pair of sanding belt drums 16 and 17 on which is entrained an endless belt of sandpaper 18. That portion of the sandpaper belt 13 extending between the belt drums i6 and 17 and exposed beyond the belt guard portion 15 of the casing is referred to as the working flight, and it is conventional in machines of this type to provide within the endless sandpaper belt a backing plate carried by the casing to maintain the working flight substantially within a plane extending tangentially between the peripheries of the drums 16 and i7. One of the drums, such as the drum 16, is adapted to be driven from a motor in the motor housing by means of a link chain, clip belt, cog belt or the like (not shown) and it is known in the art to provide a drive chain or belt guarding portion 19 as part of the sander casing to encase this drive.

The bench mounting fixture of this invention comprises a base member adapted to be secured by a plurality of fastening screws 31 to the horizontal top of a bench, table, or the like 32 and formed with a depending flange 33 disposed parallel to the edge of the bench. Pivotally connected to the flange 33 on a pivot stud 34 secured therein is a sander supporting bracket member, indicated generally at 35, and including a fiat plate 36 disposed substantially parallel to the flange 33 and formed at each side with a raised. boss 37. The bosses 37 may be provided each with a strengthening web 38 and are each bored and threaded to accommodate an elongated clamp bolt 39, which bolts extend substantially perpendicular to the plate 36. The clamp bolts 39 are each formed at the free extremity with a portion of reduced diameter to defining a shoulder 41 against which a locking plate 42 is loosely received and constrained by a knurled knob 43 secured on the bolt portion 4d. The locking plate 42 on each clamp bolt is formed with an inturned lip 44 adapted to engage over the edge of the sanding belt guard portion 15 of the portable sander to clamp the sander tightly against the plate 36 of the bracket member when the knurled knobs are turned to tighten the clamp bolts 39.

In addition to the clamp bolts 39 for rigidly securing the sander to the bracket member 35 and for locating the working flight positively relatively thereto, the plate 36 is formed with a plurality of locating lugs 45 arranged snugly to embrace the drive chain guard portion 19 of the sander casing when the sander is secured in place by the clamp bolts 39.

Secured in the depending flange 33 of the base member is a guide pin 5t? which is slidably accommodated in an arcuate slot 51 formed in the plate 36 of the bracket member and preferably extends over a 90 segment so that the ends thereof serve as stops limiting the pivotal movement of the bracket member 35 through a 90 arc, at one limit positioning the working flight of the sanding belt of a sander clamped thereto parallel to the top of the bench 32, and at the other limit positioning the working flight perpendicular to the top of the bench. A latch lever 52 fulcrumed on the base member 34) and formed with a curved latch finger 53 may be turned to position the latch finger beneath a latch lug 54 on the plate 36 of the bracket member 35 to constrain the bracket member in the position illustrated in the drawings in which the working flight of the sanding belt is parallel to the top of the bench, and when the bracket member 35 is turned to position the working flighit of the sanding belt perpendicular to the top of the bench the latch lever may be turned to position the latch finger 53 beneath a latch lug 55' on the plate 36 of the bracket member, thus constraining the bracket member in selected position of adjustment,

For securing a work guiding fence transversely across the work flight of the sanding belt, the bracket member 35 is formed with an upstanding post formed with a seat provided by beveled side edges 61, and drilled and tapped, as as 62, parallel to the clamp bolts 39. A fence supporting shank 63 is formed with a beveled recess 64 complemental to the beveled portions 61 of the post 6 0 and is slotted, as at 65, to accommodate a knurled clamp screw 66 threaded into the tapped hole 62 in the post to secure the fence supporting shank thereto with provision for limited adjustment toward and away from the work-- ing flight-of the sanding belt. .The work guiding fence is formed witha flat work engaging plate 6-7 and a flange: 68 formed at one side thereof and at right angles there-- to. A strengthening web 69 may be provided between the flange 68 and the work engaging plate 67. The flange 68 is formed with a bearing aperture 70 adapted to be journaled on a pivot pin or rivet 71 secured in the fencesupporting bracket. The flange 68 is also formed with an arcuate slot 72 adapted to accommodate a clamp bolt 73- provided with a knurled clamp nut 74 which passes through a clearance aperture 75 in the fence supporting shank to secure the fence in selected angular position relatively to the plane of the work flight of the sanding belt. The flange 68 may be formed with a notch 76 to register with indicia 77 carried on the fence supporting shank as illustrated in FIG. 3, to provide visual indication of the position of angular adjustment of the work engaging plate 67 of the fence with respect to the place of the work flight of the sanding belt.

For securing the work guiding fence lengthwise parallel to the direction of motion of the sanding belt along the work flight thereof, the bracket member 35 is formed with an upstanding post 80 identical with the post 60 save that the beveled sides and tapped hole face perpendicular to the clamp bolts 39. To shift the fence from a position transversely across the work flight, as iilustrated in solid lines in FIG. 1, to a position longitudinally along the work flight, as illustrated in dot and dashed lines in FIG. 1, the operator simply removes the clamp screw 66 which releases the fence supporting shank from whichever post 6!) or 80 it has been secured and relocates. the fence supporting shank and with it the fence 67 to the opposite post using the clamp screw 66 to secure the fence supporting shank in place thereon.

Having thus set forth the nature of the invention, what we claim herein is:

1. A fixture for mounting a portable sander relatively to a bench top, comprising a base, means for securing said base along one edge of a bench top, a sander supporting bracket, means pivotally securing said bracket to said base on an axis parallel to the bench top and perpendicular to the edge thereof along which said base is secured, clamp means on said bracket for securing a portable sander thereto, and a plurality of cooperating latch means on said base and bracket for selectively locking said said bracket in diiferent angular positions relatively to said bench top.

2. A fixture for mounting a portable sander relatively to a bench top, comprising a base, means for securing said base along one edge of a bench top, a sander supporting bracket, means pivotally securing said bracket to i said base on an axis parallel to the bench top and perpendicular to the edge thereof along which said base is secured, clamp means on said bracket for securing a portable sander thereto, an operator influenced, shiftable latch member carried by said base, and a plurality of latch lugs carried by said bracket each disposed for coopertion with said shiftable latch member to lock said bracket in a different position relatively to said bench top.

3, A fixture as set forth in claim 2 in which said latch lugs are arranged on said bracket and relatively to said shiftable latch member to position a working flight of a portable sander secured on said bracket by said clamp means in either parallel or perpendicular relation to the bench top to which said base is secured.

4. A fixture for mounting to a bench top a portable sander having a casing and means for moving an abrasive sheet in a substantially planar working flight relatively to said casing, said fixture comprising a base, means for securing said base relatively to a bench top, a bracket plate, means for pivotally securing said bracket plate to said base in a position substantially perpendicular to the bench top to which said base is secured, means formed on said bracket plate defining a seat accommodating said portable sander casing in a predetermined position thereon, clamp means carried by said bracket plate for securing the portable sander casing in said predetermined position thereon, and a plurality of cooperating latch means on said base and said bracket plate for locking said bracket plate selectively in diflerent angular positions relatively to said bench top.

5. In a fixture as set forth in claim 4, a work supporting fence including a substantially planar work engaging plate and a fence supporting shank, a seat portion formed on said bracket plate complemental to said fence supporting shank, and means for clamping said fence supporting shank on said seat portion.

6. A fixture as set forth in claim 5 in which said seat portion is arranged to accommodate said fence supporting shank with said work engaging plate disposed transversely across the working flight of the abrasive sheet of said portable sander, and a second seat portion formed on said bracket plate complemental to said fence sup porting shank and arranged to accommodate said fence supporting shank with said work engaging plate disposed longitudinally across the working flight of the abrasive sheet of said portable sander.

7. A fixture for mounting to a bench top a portable belt sander having a casing and means for drivingly sustaining an abrasive belt to provide a substantially planar working flight relatively to said casing, said fixture comprising a base, means for securing said base relatively to a bench top, a bracket plate, means for pivotally securing said bracket plate to said base in a position substantially perpendicular to the bench top and on an axis perpendicular to the edge of said bench top to which said base is secured, means formed on said bracket plate defining a seat accommodating said portable sander casing in a predetermined position thereon, clamp means carried by said bracket plate for securing the portable sander casing in said predetermined position thereon, a latch lever carried on said base, a pair of latch lugs carried on said bracket plate and disposed each for cooperation with said latch lever and arranged to lock said bracket plate relatively to said base with the working flight of a portable sander clamped thereto disposed selectively perpendicular or parallel to the bench top.

8. In a fixture as set forth in claim 7, a work supporting fence including a substantially planar work engaging plate and a fence supporting shank, a first post carried on said bracket plate on one side of the working flight of a portable sander clamped on said bracket plate, a seat portion formed on said first post complemental to said fence supporting shank and arranged to accommodate said shank thereon with said work engaging plate disposed transversely across said working flight, a second post carried on said bracket plate on the opposite side of the working flight of a portable sander clamped on said bracket plate, a seat portion formed on said second post complemental to said fence supporting shank and arranged to accommodate said shank thereon with said work engaging plate disposed lengthwise along said working flight, and means for clamping said fence supporting shank selectively on a selected one of said posts.

References Cited in the file of this patent UNITED STATES PATENTS 809,254 Golden Jan. 2, 1906 1,631,898 Swan June 7, 1927 2,232,149 Tautz Feb. 8, 1941 2,467,978 Kerr et al. Apr. 19, 1949 2,674,070 Thomas et al. Apr. 6, 1954 2,763,103 Bader Sept. 18, 1956 2,888,965 Phillips June 2, 1959 

